| [Presentation title] | [Client Name] | [Date] 1

Paper technology

Wood pulp / Bleaching (2)

Technical Support

Sappi Fine Paper Europe

| [Presentation title] | [Client Name] | [Date] 2

Wood pulp production

| [Presentation title] | [Client Name] | [Date] 3

Wood pulp

The digester is opened

Introduction of the vapour filling apparatus

Placing of the vapour filling apparatus

The chips are cooked in the digester for 8-10 hours

with the chemical magnesium bisulphite. It reacts

with the lignin of the wood to lignin sulphone acid

which is completely water-soluble and can, thus,

be easily washed out of the pulp.

| [Presentation title] | [Client Name] | [Date] 4

Wood pulp

Sampling of cooking acid Control of the pulping degree

Emptying of the digester Diffusion washing

| [Presentation title] | [Client Name] | [Date] 5

Wood pulp

Process monitoring Wood pulp washing

Wood pulp before washing Wood pulp after washing

| [Presentation title] | [Client Name] | [Date] 6

Bleaching towers

| [Presentation title] | [Client Name] | [Date] 7

Bleaching tower

| [Presentation title] | [Client Name] | [Date] 8

Observation point pulp mill

| [Presentation title] | [Client Name] | [Date] 9

Wood pulp

Unwashed, unbleached wood pulp Wood pulp in the bleaching intermediate step

Bleached and unbleached wood pulp

| [Presentation title] | [Client Name] | [Date] 10

Fibrous substances

Long fibres

Length: 800 - 4500 µm

Thickness: 25 - 80 µm

Short fibres

Length: 200 - 800 µm

Thickness: 2,5 - 28 µm

| [Presentation title] | [Client Name] | [Date] 11

Fibre

Hygroscopic effect by capillaries

Moving direction of

the fibre

Extension direction of

the fibre

| [Presentation title] | [Client Name] | [Date] 12

Wood pulp bale